im wondering if anyone can help me with this. its a 1992 fourtrax 300 2x4. it cranks and idles but when you give it gas it revs up but not fully. i put a new carb on it so its not the carb. but if i cover up half of the hole in the breather box that the carbs pulls its air in with, then it revs up and runs fine. so its getting to much air or not enough fuel. any suggestions would be greatly appreciated. thanks. also it started doing this after i pressured washed it in durhamtown a couple weeks ago if that might help.